/**********
Copyright 1990 Regents of the University of California.  All rights reserved.
Author: 1987 Gary W. Ng
Modified by Dietmar Warning 2003
**********/

#include "ngspice/ngspice.h"
#include "diodefs.h"
#include "ngspice/cktdefs.h"
#include "ngspice/iferrmsg.h"
#include "ngspice/noisedef.h"
#include "ngspice/suffix.h"

/*
*DIOnoise (mode, operation, firstModel, ckt, data, OnDens)
*    This routine names and evaluates all of the noise sources
*    associated with diodes.  It starts with the model *firstModel and
*    traverses all of its instancess.  It then proceeds to any other
*    models on the linked list.  The total output noise density
*    generated by all of the diodes is summed with the variable
*    "OnDens".
 */

int
DIOnoise(int mode, int operation, GENmodel *genmodel, CKTcircuit *ckt,
         Ndata *data, double *OnDens)
{
    NOISEAN *job = (NOISEAN*) ckt->CKTcurJob;

    DIOmodel *firstModel = (DIOmodel*) genmodel;
    DIOmodel *model;
    DIOinstance *inst;
    double tempOnoise;
    double tempInoise;
    double noizDens[DIONSRCS];
    double lnNdens[DIONSRCS];
    int i;
    double dtemp;

    /* define the names of the noise sources */

    static char *DIOnNames[DIONSRCS] = {
        /* Note that we have to keep the order
           consistent with thestrchr definitions in DIOdefs.h */
        "_rs",        /* noise due to rs */
        "_id",        /* noise due to id */
        "_1overf",    /* flicker (1/f) noise */
        ""            /* total diode noise */
    };

    for (model = firstModel; model != NULL; model = DIOnextModel(model)) {
        for (inst = DIOinstances(model); inst != NULL; inst = DIOnextInstance(inst)) {

            switch (operation) {

            case N_OPEN:

                /* see if we have to to produce a summary report */
                /* if so, name all the noise generators */

                if (job->NStpsSm != 0) {
                    switch (mode) {

                    case N_DENS:
                        for (i = 0; i < DIONSRCS; i++) {
                            NOISE_ADD_OUTVAR(ckt, data, "onoise_%s%s", inst->DIOname, DIOnNames[i]);
                        }
                        break;

                    case INT_NOIZ:
                        for (i = 0; i < DIONSRCS; i++) {
                            NOISE_ADD_OUTVAR(ckt, data, "onoise_total_%s%s", inst->DIOname, DIOnNames[i]);
                            NOISE_ADD_OUTVAR(ckt, data, "inoise_total_%s%s", inst->DIOname, DIOnNames[i]);
                        }
                        break;
                    }
                }
                break;

            case N_CALC:
                switch (mode) {

                case N_DENS:

                    if (inst->DIOtempGiven)
                        dtemp = inst->DIOtemp - ckt->CKTtemp + (model->DIOnomTemp-CONSTCtoK);
                    else
                        dtemp = inst->DIOdtemp;

                    NevalSrcInstanceTemp(&noizDens[DIORSNOIZ],&lnNdens[DIORSNOIZ],
                        ckt, THERMNOISE, inst->DIOposPrimeNode, inst->DIOposNode,
                        inst->DIOtConductance, dtemp);

                    NevalSrc(&noizDens[DIOIDNOIZ],&lnNdens[DIOIDNOIZ],
                        ckt, SHOTNOISE, inst->DIOposPrimeNode, inst->DIOnegNode,
                        *(ckt->CKTstate0 + inst->DIOcurrent));

                    NevalSrc(&noizDens[DIOFLNOIZ], NULL, ckt,
                        N_GAIN, inst->DIOposPrimeNode, inst->DIOnegNode,
                        (double) 0.0);
                    noizDens[DIOFLNOIZ] *= model->DIOfNcoef *
                        exp(model->DIOfNexp *
                            log(MAX(fabs(*(ckt->CKTstate0 + inst->DIOcurrent) / inst->DIOm), N_MINLOG))) /
                        data->freq * inst->DIOm;
                    lnNdens[DIOFLNOIZ] =
                        log(MAX(noizDens[DIOFLNOIZ], N_MINLOG));

                    noizDens[DIOTOTNOIZ] = noizDens[DIORSNOIZ] +
                        noizDens[DIOIDNOIZ] +
                        noizDens[DIOFLNOIZ];
                    lnNdens[DIOTOTNOIZ] =
                        log(MAX(noizDens[DIOTOTNOIZ], N_MINLOG));

                   *OnDens += noizDens[DIOTOTNOIZ];

                    if (data->delFreq == 0.0) {

                        /* if we haven't done any previous integration, we need to */
                        /* initialize our "history" variables                      */

                        for (i = 0; i < DIONSRCS; i++) {
                            inst->DIOnVar[LNLSTDENS][i] = lnNdens[i];
                        }

                        /* clear out our integration variables if it's the first pass */

                        if (data->freq == job->NstartFreq) {
                            for (i = 0; i < DIONSRCS; i++) {
                                inst->DIOnVar[OUTNOIZ][i] = 0.0;
                                inst->DIOnVar[INNOIZ][i] = 0.0;
                            }
                        }
                    } else {
                        /* data->delFreq != 0.0 (we have to integrate) */

                        /* To insure accurracy, we have to integrate each component separately */

                        for (i = 0; i < DIONSRCS; i++) {
                            if (i != DIOTOTNOIZ) {
                                tempOnoise = Nintegrate(noizDens[i], lnNdens[i],
                                    inst->DIOnVar[LNLSTDENS][i], data);
                                tempInoise = Nintegrate(noizDens[i] * data->GainSqInv,
                                    lnNdens[i] + data->lnGainInv,
                                    inst->DIOnVar[LNLSTDENS][i] + data->lnGainInv,
                                    data);
                                inst->DIOnVar[LNLSTDENS][i] = lnNdens[i];
                                data->outNoiz += tempOnoise;
                                data->inNoise += tempInoise;
                                if (job->NStpsSm != 0) {
                                    inst->DIOnVar[OUTNOIZ][i] += tempOnoise;
                                    inst->DIOnVar[OUTNOIZ][DIOTOTNOIZ] += tempOnoise;
                                    inst->DIOnVar[INNOIZ][i] += tempInoise;
                                    inst->DIOnVar[INNOIZ][DIOTOTNOIZ] += tempInoise;
                                }
                            }
                        }
                    }
                    if (data->prtSummary) {
                        for (i = 0; i < DIONSRCS; i++) {
                            /* print a summary report */
                            data->outpVector[data->outNumber++] = noizDens[i];
                        }
                    }
                    break;

                case INT_NOIZ:
                    /* already calculated, just output */
                    if (job->NStpsSm != 0) {
                        for (i = 0; i < DIONSRCS; i++) {
                            data->outpVector[data->outNumber++] = inst->DIOnVar[OUTNOIZ][i];
                            data->outpVector[data->outNumber++] = inst->DIOnVar[INNOIZ][i];
                        }
                    } /* if */
                    break;
                } /* switch (mode) */
                break;

            case N_CLOSE:
                return (OK); /* do nothing, the main calling routine will close */
                break; /* the plots */
            } /* switch (operation) */
        } /* for inst */
    } /* for model */

    return (OK);
}